Juliette was born in 1581 in Bretagne, France. At the time , the European countryside was overruled by a group of vampires , called the first coven. They demanded the firstborns of many families. In some families , they would take more then one child.
In the David family , they demanded 4 children. So Julie , along with her elder brother James , and younger brother John , were taken away. At the age of 20 , she was first drained of blood ,before being turned into a vampire seconds before her last breath. She was then left abandoned along with 5 other teens , including her younger brothers , but there was no sign of James.
After spending years searching for whoever did this to her , she shifted focus and began looking for James , as she realized she might have forever now , but if James got away he'd stay mortal and he'd live only a few years longer. Her angryness at him quickly turned into rage , causing revenge to be the main thing on her mind.
She quickly applied to be a recognized group of allies with the Anconi , who have to approve every application , but she was denied the rights as she could not track down her sire and bloodline. This didn't stop her from being a leader to her younger brothers ,and adding other members , such as the Woods twins ; Aria and Ivy Woods.
She and her brothers decided to travel to Europe in the late 1990's , and spent some time observing James and his new family . When James moved to Waterfall Creek , Julie followed a few weeks later.
That is when her plan changed , as she noticed that the Silverstone Sisters were part of the family and that they would be doing way more damage if they would've eliminated them. That way James Dawson would be in danger of breakig his promise to protect them , and he would come for them himself. And it worked, because they had what they wanted when he came to the rescue, with the rest of his family.